Features:- 12mm Six-Sided, Chain Links Made Of 3t Hardened Manganese Steel For Maximum Strength- Durable, Protective Nylon Cover With Hook-N-Loop Fasteners To Hold In Place- Includes Evolution Series 4 Disc Lock With 14mm Max-Performance Steel Shackle- Patented*, Oval Hardened Steel Crossbar For Extra Security- Hardened Double Deadbolt Locking For Extensive Holding Power- High Security Disc-Style Cylinder With Reinforced Anti-Drill, Anti-Pull Protection System- Sliding Dustcover Protects And Extends Cylinder Life- 3 Stainless Steel Keys – One Lighted With High Intensity Bulb And Replaceable Battery- Key Safe ProgramSpecifications:- Product Dimensions: 3.25' (100cm) Chain Length 14mm Shackle Diameter- Product Weight: 8.65 Lbs (3.92 Kgs)